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Dielectric and Ferroelectric Properties of Nanocrystalline Bi 2 Ti 2 O 7 Prepared by a Metallorganic Decomposition Method
Author(s) -
Hou Yun,
Wang Min,
Xu XiaoHong,
Wang Dong,
Wang Hong,
Shang ShuXia
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00585.x
Subject(s) - ferroelectricity , nanocrystalline material , materials science , curie temperature , annealing (glass) , dielectric , analytical chemistry (journal) , nanocrystal , hysteresis , grain size , decomposition , mineralogy , crystallography , nanotechnology , condensed matter physics , chemistry , metallurgy , ferromagnetism , physics , optoelectronics , organic chemistry , chromatography
Nanopowders of Bi 2 Ti 2 O 7 were synthesized by a metallorganic decomposition (MOD) technique. Pure Bi 2 Ti 2 O 7 nanocrystals formed after annealing at 550°C for 5 min. X‐ray patterns show that Bi 20 TiO 32 is a metastable phase during Bi 2 Ti 2 O 7 formation. It was found that there were two peaks in the curves of the dielectric response as a function of temperature for pressed nanocrystalline Bi 2 Ti 2 O 7 samples. The Curie temperature decreases with decrease of grain size whereas the ferroelectric‐ferroelectric phase transition temperature increases. The hysteresis loops observed also suggest that Bi 2 Ti 2 O 7 might belong to a ferroelectric material.